Ab initio

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Quantum physics is called an ab initio model because it describes systems from “first principles” (e.g., Schrödinger equation, quantum field theory) without empirical fitting, relying only on fundamental constants.

In case of classical mechanics, this is ab initio when derived from Newton’s laws, for example, without phenomenological input, solving systems from fundamental principles (mass, force, energy).

Classical electromagnetism is ab initio when based on Maxwell’s equations, treating fields and charges as foundational.

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